Wrench.



E. NORBO.

WRENCH.

APPLICATION FILED MAR. 7, 1914.

Patented May 12, 1914.

1 i I IHHIHHHW COLUMBIA FLANOORAPH $0., WASHINGTON. u. c.

wanna,

ELVEN NORBO, OIE CASHTON, WISCONSIN.

WRENCH.

Specification of Letters Patent.

Patented May 12, 1914.

Application filed March 7, 1914. Serial No. 823,232.

To all whom it may concern:

Be it known that I, ELVEN Nonno, a citizen of the United States, residing at Cashton, in the county of Monroe and State of \Visconsin, have invented certain new and useful Improvements in renches, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in wrenches and has relation more particularly to a device of this general character especially designed and adapted for use in connection with pipes Or the like; and the object of the invention is to provide a device of this general character having novel and improved means whereby the same adjusts itself to the pipe to which it is adapted to be applied in substantially an automatic manner.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved wrench whereby certain important advantages are attained and the device is rendered simpler, less expensive and otherwise more convenient and advantageous for use, all as will be hereinafter more fully set forth.

The novel features of the invention will be carefully defined in the appended claims.

In order that my invention may be the better understood, 1 will now proceed to describe the same with reference to the acc0mpanying drawings, wherein Figure l is a view in plan of a wrench constructed in accordance with an embodiment of my invention, the same being shown in an adjustment to engage a pipe, the pipe being indicated by dotted lines; Fig. 2 is a view in plan of a wrench as disclosedin F 1 but with the parts shown adjusted into inoperative position; Fig. 3 is a sectional View taken substantially on the line 33 of Fig. 2; and Fig. 4 is a view in end elevation of the device as herein set forth.

As disclosed in the accompanying drawings, 1 denotes the bar or handle lever of my improved wrench of predetermined length having coacting therewith, the gripping bar 2, t 1e outer or forward extremity of the engaging face of such gripping bar 2 being provided, as at 3, with the biting teeth or serrations, while the forward or outer extremity of the opposed edge of the bar or handle lever l is straight and unobstructed whereupon it will be seen that the cutting or biting action is accomplished by the gripping bar 2 alone while the bar or handle lever is free to slip around the pipe to which the improved wrench may be applied, wherebv it will be readily perceived that the requisite adjustment of the bars 1 and 2 is accomplished in substantially an automatic manner.

The lower or inner extremity of the bar 2 is pivotally connected, as at 4:, between the free extremities of the substantially U- shaped member 5 capable of endwise movement upon the bar or handle lever 1, while the forward portion of such bar 2, intermediate its length but in close proximity to its forward or outer end, is pivotally engaged with the bar or handle lever 2 through the medium of the links 6, the length of such links 6 and the positioning of the pivotal connections 7 of such links are such as to cause the outer extremities of the bars 1 and 2 to be substantially flush when the bar 2 is adjusted to its outermost position whereby the opposed faces of the bars 1 and 2 will be in substantial contact. It-will also be observed that the connections between the bars 1 and 2 are such as to permit the opposed faces of the bars to be in substantial contact when the bar 2 is adjusted to the limit of its inward movement, whereby the wrench will occupy a minimum of space when not in use which is particularly advantageous when it is desired to place the implement in a tool chest or the like.

At a predetermined point below the pivotal connection 7 of the links 6 with the bar or handle lever 1 and in the working face of such bar or handle lever, I produce a series of teeth 8 adapted to be engaged by the segmental racks 9 produced at the inner side of the rear extremity of the bar 2 whereby it will be readily perceived that when the bars 1 and 2 are operatively engaged with a pipe or the like, such bars are effectively and automatically maintained against such relative inward movement as would result in a separation thereof and thus become disengaged from the pipe or the like during the use of the wrench.

From the foregoing description, it is thought to be obvious that a wrench constructed in accordance with an embodiment of my invention is of an extremely simple and comparatively inexpensive nature and is particularly well adapted for use by reason of the substantially automatic manner in which it operates, and it will also be obvious that my invention is susceptible of some change and modification without material departure from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the pre cise arrangement and formation of the several parts herein shown in carrying out my invention in practice.

Having thus fully described my invention What I desire to claim and secure by Letters Patent, is:

A device of the character described comprising an elongated bar having its working face smooth and unobstructed and provided with a plurality of teeth rearwardly of such working face, a gripping bar coacting with the working face of the elongated bar and having its working face provided with a plurality of serrations, a sleeve slidably en- 20 the gripping bar and the elongated bar in 25 advance of the teeth thereon the inner extremity of the gripping bar being provided with a segmental rack adapted to interinesh with the teeth of the elongated bar.

In testimony whereof I hereunto afiix my 30 signature in the presence of two witnesses.

ELVEN NORBO.

Witnesses JAMns TJ-IOMPSON, JOHN GnLnEcK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

